DEBIAN-CVE-2026-59885
pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.4, the BER, CER, and DER decoders process OBJECT IDENTIFIER and RELATIVE-OID values in quadratic time relative to the number of arcs, so a small crafted payload containing an OID with many arcs consumes excessive CPU per decode() call and can deny service to applications that decode untrusted ASN.1 data. The corresponding encoders have the same quadratic behavior when an application re-encodes previously decoded attacker-supplied values. This issue is fixed in version 0.6.4.
DEBIAN-CVE-2026-59885
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-59885
pyasn1
Source reference: /affected/0/package/name
- Affected versions
- 0.4.8-3
Source reference:
/affected/0/versions0.4.8-3+deb12u1Source reference:
/affected/0/versions0.4.8-3+deb12u2Source reference:
/affected/0/versions - Fixed versions
- 0.4.8-3+deb12u3
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
pyasn1
Source reference: /affected/1/package/name
- Affected versions
- 0.6.1-1
Source reference:
/affected/1/versions0.6.1-1+deb13u1Source reference:
/affected/1/versions0.6.1-1+deb13u2Source reference:
/affected/1/versions - Fixed versions
- 0.6.1-1+deb13u3
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
pyasn1
Source reference: /affected/2/package/name
- Affected versions
- 0.6.1-1
Source reference:
/affected/2/versions0.6.2-1Source reference:
/affected/2/versions0.6.2-1~bpo13+1Source reference:
/affected/2/versions0.6.3-1Source reference:
/affected/2/versions0.6.4-1~bpo13+1Source reference:
/affected/2/versions - Fixed versions
- 0.6.4-1
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.4.8-3+deb12u3"
}
]
}
],
"package": {
"name": "pyasn1",
"purl": "pkg:deb/debian/pyasn1?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"0.4.8-3",
"0.4.8-3+deb12u1",
"0.4.8-3+deb12u2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-59885.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.6.1-1+deb13u3"
}
]
}
],
"package": {
"name": "pyasn1",
"purl": "pkg:deb/debian/pyasn1?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"0.6.1-1",
"0.6.1-1+deb13u1",
"0.6.1-1+deb13u2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-59885.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.6.4-1"
}
]
}
],
"package": {
"name": "pyasn1",
"purl": "pkg:deb/debian/pyasn1?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"0.6.1-1",
"0.6.2-1",
"0.6.2-1~bpo13+1",
"0.6.3-1",
"0.6.4-1~bpo13+1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-59885.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #58047 · Revision 1
- Added to Heist Feed
- Publisher date